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IT용 초소형부품의 불량검출과 산업현장의 재해방지 효과
박대영(Dea-Young Park),정양근(Yang Guen Jeong),최선미(Sun Mi Choi),변재영(Jea Young Byun),최원식(Won-Sik Choi) 한국산업융합학회 2015 한국산업융합학회 논문집 Vol.18 No.1
This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space. The system was introduced into a real building and was examined by the field measurement. Judging from the measurements during three years(1999~2001), the state of the system operation was very stable through this period and it was clear that the system contributes to reduction of energy consumption for air-conditioning. Futhermore, a simulation model used the simple heat diffusion equation was developed to simulate its thermal characteristics and performances. The simulations resulted in air temperature in good agreement with the measurements. Also, from the result of numerical analysis, it is clear that the amount of heat supply by using this system is more than the amount of energy loss to the room above it. Therefore, it is concluded that this systems is very useful and the proposed numerical model can be used for the prediction of system thermal performance.
논문: 건설용 이형 철근(SD35, SD30A)의 점용접성
이수연 ( Su Yeon Lee ),이찬규 ( Chan Gyu Lee ),( Vladimir S. Gornakov ),( Osamu Taguchi ),유대황 ( Dea Hwang Yoo ),윤국태 ( Kuk Tea Youn ),박대영 ( Dae Young Park ),허석환 ( Seok Hwan Huh ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.5
The spot weldability of metal joints between SD35 and SD30A steel was investigated. This study was aimed to determine the spot welding parameters (i.e. welding current and time) for reinforcement bar joint and to evaluate the weldability, mechanical strength, hardness and microstructure. The results indicated that shear strength and elongation of the welding joints at 12.5kA and 1000ms were 26.7kgf/mm2 and 22%, respectively. And fracture distribution of them by using shear and tensile test showed 100% necking mode and 100% ductile mode, respectively.